证明哥德巴赫猜想的C编程

#include <stdio.h>
int prime (int a);

int main ()
{
    int a,b,c;
    int judgment;
    printf ("Please enter a large even number (>=4):");
    while (scanf("%d",&a)==1)
    {
        if(a%2==0)
            for (b=2;b<=a;b++)
            {
                judgment=sushu (b);
                if (judgment==1)
                {
                    c=a-b;
                    judgment=sushu (c);
                    if (judgment==1)
                        printf ("%d=%d+%d ",a,b,c);
                }
                else
                    break;
                
            }
            else
                printf ("Error!");
    }
    return 0;
}

int prime (int n)
{
    int i;
    for (i=2;i*i<n;i++)
    {
        if (n%i==0)
            return 0;
    }
    return 1;    
}
到底哪里错了!帮忙改下!!谢谢

C代码就别放在这里了，放在C论坛去吧